KIRBY: NIGHTMARE IN DREAM LAND UNLOCKABLES
Extra mode
Finish adventure mode with a 100% rank to unlock the EXTRA option at the adventure mode menu.
Meta-Knight mode
Finish extra mode with a 100% rank to unlock the META KNIGHT option in the mini game menu.
Boss mode
After finishing the game you will unlock the BOSS MODE option in the mini game menu.
Getting easy lives
If you need a lot of lives for a Boss battle go to "previous" doors and look for sub-games in other levels. First place yields 3 lives; second place yields 2 lives; third place yields 1 life; fourth place yields nothing. If you do well, you should get about 18 or 19 lives.